| #include <stdlib.h> |
| #include <unistd.h> |
| #include <stdio.h> |
| #include <errno.h> |
| #include <sys/klog.h> |
| #include <string.h> |
| |
| #define KLOG_BUF_SHIFT 17 /* CONFIG_LOG_BUF_SHIFT from our kernel */ |
| #define KLOG_BUF_LEN (1 << KLOG_BUF_SHIFT) |
| |
| // From Android sys/klog.h |
| #ifndef KLOG_READ_ALL |
| #define KLOG_READ_ALL 3 |
| #endif |
| #ifndef KLOG_READ_CLEAR |
| #define KLOG_READ_CLEAR 4 |
| #endif |
| |
| int dmesg_main(int argc, char **argv) |
| { |
| char buffer[KLOG_BUF_LEN + 1]; |
| char *p = buffer; |
| ssize_t ret; |
| int n, op; |
| |
| if((argc == 2) && (!strcmp(argv[1],"-c"))) { |
| op = KLOG_READ_CLEAR; |
| } else { |
| op = KLOG_READ_ALL; |
| } |
| |
| n = klogctl(op, buffer, KLOG_BUF_LEN); |
| if (n < 0) { |
| perror("klogctl"); |
| return EXIT_FAILURE; |
| } |
| buffer[n] = '\0'; |
| |
| while((ret = write(STDOUT_FILENO, p, n))) { |
| if (ret == -1) { |
| if (errno == EINTR) |
| continue; |
| perror("write"); |
| return EXIT_FAILURE; |
| } |
| p += ret; |
| n -= ret; |
| } |
| |
| return 0; |
| } |